HTML tags are code elements with the back-end of all web pages, but there are also specific HTML code types which provide search engines with key info for SERP display. Essentially, these elements highlight parts of your content that are relevant for search, and they describe those elements for search crawlers

I guess I’m confused by your question, as off-page SEO means content on other pages that links to your site or talks about your brand. In any case, as pretty much all content on the web is written in HTML, off-page content is HTML just as your own webpages are as well.

As far as specific HTML tags and attributes that play a role in off-page SEO, the big ones would be the meta robots noindex/nofollow tag, or link tags with a rel attribute specifying nofollow, ugc, or sponsored. The content of the other site (including its header tags, paragraph tags, etc.) all play a role.

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